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Merge pull request #54756 from andrewrynhard/fix-bind-addr

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Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

kubeadm: fix the DNS addon bind address

**What this PR does / why we need it**:
Fixes a small bug introduced in #54437 
The net package's definition of `To16` is as follows:
```
// To16 converts the IP address ip to a 16-byte representation.
// If ip is not an IP address (it is the wrong length), To16 returns nil.
func (ip IP) To16() IP {
	if len(ip) == IPv4len {
		return IPv4(ip[0], ip[1], ip[2], ip[3])
	}
	if len(ip) == IPv6len {
		return ip
	}
	return nil
}
```
We can see that the `To16 ` function returns a non nil value when passed in an IPv4 address. This PR switches the check to use `To4()` instead, which will return `nil` when passed an IPv6 address.
This commit is contained in:
Kubernetes Submit Queue 2017-10-29 07:55:25 -07:00 committed by GitHub
commit c87d3d91db
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1 changed files with 1 additions and 1 deletions
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2
cmd/kubeadm/app/phases/addons/dns/dns.go
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@ -57,7 +57,7 @@ func EnsureDNSAddon(cfg *kubeadmapi.MasterConfiguration, client clientset.Interf
}
var dnsBindAddr string
if dnsip.To16() != nil {
if dnsip.To4() == nil {
dnsBindAddr = "::1"
} else {
dnsBindAddr = "127.0.0.1"